THE COLLISION THEORY.pptx
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The collision theory states that chemical reactions occur when reactant molecules collide with sufficient kinetic energy to reach the transition state. The reaction rate is affected by factors like temperature, surface area, concentration of reactants, and catalysts - an increase in temperature or concentration raises the kinetic energy and number of collisions of reactants, speeding the reaction rate, while more surface area or a catalyst provide more opportunities for collisions without being consumed in the reaction.
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Collision theory states that chemical reactions occur when particles collide with sufficient energy. The speed of reactions is affected by factors that influence collision frequency and energy, including concentration, pressure, and temperature. Higher concentrations, pressures, and temperatures all lead to more frequent and energetic collisions between particles, accelerating the rate of chemical reactions.
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This document discusses 5 key factors that affect the rate of chemical reactions:
1. The surface area of solid reactants - increasing the surface area by powdering increases the rate.
2. The concentration of reactants - higher concentrations increase the number of collisions and thus the rate.
3. The temperature - higher temperatures provide more energy, increasing the fraction of molecules that can overcome the activation energy barrier.
4. The presence of catalysts - catalysts lower the activation energy and increase the rate of reaction.
5. Exposure to light - light provides photons that can supply the energy needed to overcome activation barriers in photochemical reactions.
This document discusses 5 key factors that affect the rate of chemical reactions:
1. The surface area of solid reactants - increasing the surface area by powdering increases the rate.
2. The concentration of reactants - higher concentrations increase the number of collisions and thus the rate.
3. The temperature - higher temperatures provide more energy to overcome the activation energy barrier.
4. The presence of catalysts - catalysts lower the activation energy and increase the rate.
5. Exposure to light - light provides photons that can supply the energy needed to initiate photochemical reactions.
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